One year ago, Baltimore was plunged into chaos after the funeral of Freddie Gray, a 25-year-old African-American who died after suffering a spinal injury while in police custody. Violence erupted following the funeral on 27 April 2015 leading to a state of emergency being declared and a curfew in place until 3 May. Protesters demanded justice for Gray, whose fatal encounter with officers came amid the national debate over police use of force, especially when black suspects are involved.

Baltimore Freddie Gray
Police form a line at North Ave and Pennsylvania Ave in Baltimore, on April 28, 2015Eric Thayer/Reuters
Baltimore Freddie Gray
A demonstrator stands in front of the police line on the corner of West North Avenue and Pennsylvania Avenue, on April 28, 2015Shannon Stapleton/Reuters
Baltimore Freddie Gray
April 28, 2015: A helicopter with a spotlight hovers over police and protesters near the CVS pharmacy that was set on fire, before the introduction of a mandatory, city-wide curfew of 10pmAndrew Burton/Getty Images
Baltimore Freddie Gray
Protesters gesture at police shortly before the deadline for a city-wide curfew passed in Baltimore, on April 28, 2015Eric Thayer/Reuters
Baltimore Freddie Gray
Protesters defy the curfew in front of a line of police officers on April 28, 2015, the night after city-wide riotingMark Makela/Getty Images
Baltimore Freddie Gray
After being Tasered by police, a man is led by officers to an ambulance on April 25, 2015. Four men were arrested after breaking windows and attempting to loot shops following a gathering of hundreds of protestersMark Makela/Getty Images

"The causes of the civil disturbance in Baltimore last year have not been eliminated," Billy Murphy, a lawyer who represents Gray's family and settled a $6.4m (£4.4m) civil settlement with the city, told Reuters. "This can happen again," he said, adding that he was not speaking for Gray's relatives. Gray's death has since helped stoke Black Lives Matter, a movement that has challenged police treatment of minorities.

Baltimore Freddie Gray
April 28, 2015: A protester carrying a sign walks through tear gas near the CVS pharmacy that was set on fire as police enforce a mandatory, city-wide curfew of 10pmAndrew Burton/Getty Images
Baltimore Freddie Gray
A protester walks through thick smoke after several buildings were set ablaze by rioters in BaltimoreJim Bourg/Reuters
Baltimore Freddie Gray
An armoured police car is pelted with rubbish as it moves down a street shortly after the deadline for a city-wide curfew passed on April 28, 2015Shannon Stapleton/Reuters
Baltimore riots
People protesting the death of Freddie Gray and demanding police accountability move into the streets in the Sandtown neighbourhood where Gray was arrestedAndrew Burton/ Getty Images
Baltimore riots
People protesting the death of Freddie Gray and demanding police accountability move into the streets in the Sandtown neighbourhood where Gray was arrestedAndrew Burton/ Getty Images
Baltimore Freddie Gray
Baltimore city firefighters gather near a home which was set ablaze in west Baltimore on April 28, 2015, after the funeral of Freddie GrayAdrees Latif/Reuters
Baltimore Freddie Gray
A firefighter uses a saw to open a metal gate while fighting a fire in a convenience store and residence in the early morning hours of April 28, 2015Eric Thayer/Reuters
Baltimore Freddie Gray
A mixture of milk and water rolls down a man's chest in an attempt to neutralise pepper spray on April 27, 2015Chip Somodevilla/Getty Images

With a Democratic mayoral primary two days away, setting the stage for November's US presidential election, many Baltimore voters are looking for new leadership to solve the issues facing the city of 620,000 people, most of whom are African-American. Current mayor Stephanie Rawlings-Blake is not running for re-election.

Baltimore Freddie Gray
Protesters clash with police during a march in honour of Freddie Gray in Baltimore on April 25, 2015Alex Wong/Getty Images
Baltimore Freddie Gray
A protester wears a Baltimore police department hat that was taken out of a damaged police car on April 25, 2015Shannon Stapleton/Reuters
Baltimore Freddie Gray
A demonstrator confronts police near Camden Yards, home of the Orioles baseball teamSait Serkan Gurbuz/Reuters
Baltimore Freddie Gray
A fire hose cut by rioters sprays water into the air as firefighters attempt to extinguish a burning building during clashes in Baltimore on April 27, 2015Jim Bourg/Reuters
Baltimore Freddie Gray
Firefighters respond to a blaze at a CVS pharmacy on Pennsylvania Avenue in Baltimore on April 27, 2015Sait Serkan Gurbuz/Reuters
Baltimore Freddie Gray
A Baltimore police officer takes cover during clashes with protesters in the streets near Mondawmin MallBrendan Smialowski/AFP
Baltimore Freddie Gray
Mourners grieve by the coffin of Freddie Gray, who died following an arrest by the Baltimore police department, at Woodlawn Cemetery in Baltimore, on April 27, 2015Shannon Stapleton/Reuters
Baltimore Freddie Gray
A burnt-out CVS pharmacy is seen on April 28, 2015, the day after it was looted and set ablazeAdrees Latif/Reuters
Baltimore riots
Police officers relax while monitoring the situation near a CVS pharmacy that was looted and burned by rioters on Monday after the funeral of Freddie GrayAndrew Burton/ Getty Images
Baltimore Freddie Gray
The remains of a senior centre in Baltimore smoulder at dawn on April 28, 2015, after a night of riotsMark Makela/Getty Images
Baltimore Freddie Gray
National Guard troops stand watch along East Pratt Street in Baltimore, on April 28, 2015Eric Thayer/Reuters